#include<iostream>
#include<vector>
#include<algorithm>
using namespace std;
int main(){
    int P1,P2,N,x,count=0;
    vector<int> R;
    cin >> P1 >> P2 >> N;
    for(int i=0;i<N;i++){
        cin >> x;
        R.push_back(x);
    }
    sort(R.begin(),R.end());
    for(int i=0;i<N-1;i++){
        if(R[i]==R[i+1])    count++;
    }
    cout << count*(P1+P2);
}